Obesity has no perfect parameter for its measurement. When do we generally say a person is fat? A person is fat when his/her body starts going out of shape showing protruding belly, or loosely hanging skin with lumps of stored surplus fats. But there is one method known as BMI based on height and weight that calculates whether your weight is in proportion to your height or not.
BMI means Body Mass Index. It is a number calculated by a simple formula which is then matched against the BMI chart. You are termed as underweight, slim, normal, overweight and obese based upon the category into which your BMI falls. Both the extremities in weight are not good for health. However, the right extreme-obese, is the most dangerous one.

How do we calculate BMI?

As said earlier, it takes into account your height and weight. So formula for BMI calculation is expressed as: (weight / [height (in inches)]²) x 703. Remember to have your weight in pounds & height in inches for this BMI calculation.

Let’s say you are 5 foot 5 inches tall and weigh 150 pounds.
Convert your height into inches. 5 foot 5 inches= 65 inches.

Calculate the square of your height, (65X65) = 4225.

Divide 150 by 4225.

Multiply result by 703.

You get 24.96 as your BMI.

What does this number express?

To interpret the meaning of this number you need a BMI chart. For adult men and women, the BMI is categorized as follows:

This chart implies that if your BMI is less than or equal to 18.5 you fall into the category of underweight people. And if you BMI is 30 or goes beyond 30; you fall into the danger zone & need to lose fats soon.

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